55499947 has 2 divisors, whose sum is σ = 55499948. Its totient is φ = 55499946.

The previous prime is 55499923. The next prime is 55499959. The reversal of 55499947 is 74999455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55499947 - 2¹¹ = 55497899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55499894 and 55499903.

It is not a weakly prime, because it can be changed into another prime (55493947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27749973 + 27749974.

It is an arithmetic number, because the mean of its divisors is an integer number (27749974).

Almost surely, 2^55499947 is an apocalyptic number.

55499947 is a deficient number, since it is larger than the sum of its proper divisors (1).

55499947 is an equidigital number, since it uses as much as digits as its factorization.

55499947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The square root of 55499947 is about 7449.8286557477. The cubic root of 55499947 is about 381.4440598719. Note that the first 3 decimals are identical.

The spelling of 55499947 in words is "fifty-five million, four hundred ninety-nine thousand, nine hundred forty-seven".